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671 results for “mediating effect”
Boosting Protein Encapsulation through Lewis-Acid-Mediated Metal–Organic Framework Mineralization: Toward Effective Intracellular Delivery
<p>Relevant data for publication with DOI:</p> <p><a title="DOI URL" href="https://doi.org/10.1021/acs.chemmater.2c01338">10.1021/acs.chemmater.2c01338</a></p>
Environmental stress gradients regulate the relative importance of predator density- and trait-mediated indirect effects in oyster reef communities
<p>Predators affect community structure by influencing prey density and traits, but the importance of these effects often is difficult to predict. We measured the strength of blue crab predator effects on mud crab prey consumption of juvenile oysters across a flow gradient that inflicts both physical and sensory stress to determine how the relative importance of top predator density-mediated indirect effects (DMIEs) and trait-mediated indirect effects (TMIEs) change within systems. Overall, TMIEs dominated in relatively benign flow conditions where blue crab predator cues increased oyster survivorship by reducing mud crab oyster consumption. Blue crab DMIEs became more important in high sensory stress conditions, which impaired mud crab perception of blue crab chemical cues. At high physical stress, the environment benefitted oyster survival by physically constraining mud crabs. Thus, factors that structure communities may be predicted based on an understanding of how physical and sensory performances change across environmental stress gradients.</p>
Opposite effects of stress on effortful motivation in high and low anxiety are mediated by CRHR1 in the VTA
<p>Rat DNA sequencing data</p>
Data from: Herbivory may mediate the effects of nutrients on the dominance of alien plants
<p>1. Numerous studies have highlighted the role of nutrient availability and fluctuations therein for invasion success of alien plants. Others also highlighted the role of herbivores in invasion success. However, how herbivory and the level and fluctuations in nutrient availability interact in driving alien plant invasion into native communities remains largely unexplored.</p> <p>2. We grew eight invasive alien species as target species in pot-mesocosms with five different synthetic native communities in a three-factorial design with two levels of nutrient availability (low <i>vs</i> high), two levels of nutrient fluctuation (constant <i>vs</i> pulsed) and two levels of herbivory (with <i>vs</i> without).</p> <p>3. The relative biomass production of the alien target plants decreased in response to an increase in nutrient availability, and increased in response to the presence of herbivores. Furthermore, herbivory could interact with changes in nutrient availability and nutrient fluctuations to affect the dominance of the alien target species (a marginally significant interaction; 90% CIs: [0.005, 0.176]).</p> <p>4. Synthesis: Our multispecies experiment indicates that herbivory could mediate the interactive effect of nutrient enrichment and variability in nutrient supply on invasion of alien plants into native communities. Therefore, we recommend that studies testing the fluctuating resources hypothesis should also consider interactive effect of other trophic levels.</p>
Changes in arthropod communities mediate the effects of landscape composition and farm management on pest control ecosystem services in organically managed strawberry crops
<p>Landscape composition and local diversification practices such as polyculture, cover cropping, and hedgerows may promote natural pest control by benefiting natural enemy communities on farms. Our study employs piecewise structural equation modeling (PSEM) to test causal hypotheses regarding the effects of landscape composition and local diversification practices on arthropod communities and pest control ecosystem services.</p> <p>We sampled 27 organic strawberry fields in California's Central Coast region in 2015 and 2016 (17 repeated between years) for a total of 37 distinct sites across years. The sites were selected along orthogonal gradients of landscape composition and local diversification practices. We also investigated the effects of two common pest management practices. At each site, we sampled arthropod communities using a hand-held vacuum and performed sentinel prey experiments using the pest species <em>Lygus hesperus</em> to estimate pest control levels.</p> <p>At the landscape scale, proportion woods increased natural enemy abundance; at the local scale, diversification practices increased natural enemy diversity.</p> <p>Insecticides and tractor vacuuming, aimed at controlling pests, were indirectly detrimental to pest control services. Both practices decreased natural enemy abundance, and while insecticides also decreased pest abundance, vacuuming did not.</p> <p>Natural enemy abundance and diversity increased pest control levels, while pest abundance had the opposite effect. The PSEM results confirmed our hypotheses that landscape and local effects on pest control are mediated through changes in arthropod communities.</p> <p><em><a>Synthesis </a>and applications</em>: At the landscape scale, higher proportions of woody habitat are associated with greater natural enemy abundance, which increases pest control levels. When promoting pest control ecosystem services is a policy goal, regional planners should prioritize the conservation and restoration of woodlands in agricultural landscapes. At the local scale, decisions of individual growers can impact pest control services. For many growers, adopting practices that promote on-farm plant diversity may be a feasible solution for increasing pest control levels while avoiding the environmental and economic costs imposed by insecticide application and tractor <a>vacuuming. </a></p> <div> <div> <div class="msocomtxt"> <p class="MsoCommentText"> </p> </div> </div> </div>
Direct and legacy-mediated drought effects on plant performance are species-specific and depend on soil community composition
Droughts affect plant communities, but their impacts may be mediated by soil biota. Soil communities may ameliorate drought stress, and droughts may leave legacies of altered soil communities that may affect future plant growth. However, it is not yet understood which groups of soil biota in particular affect plant performance under drought, nor which groups contribute to drought-legacy effects on future plant growth. We hypothesized that increasing soil-community complexity ameliorates drought stress and that drought-legacy effects are species-specific and soil-community-dependent. To test these hypotheses, we performed a two-phase experiment with six grassland species. In the first phase, we examined plant performance under drought and ambient conditions, in soils inoculated with a sterilized inoculum, or increasingly complex soil communities created by wet-sieving through 20-, 40-, and 200-µm mesh sieves. In the second phase, we examined drought-legacy effects on conspecific plant performance. We separately analysed plant performance in both phases, and integrated data from both phases using structural equation models. Drought effects on first-phase root biomass depended on soil inoculum, and this interaction differed among plant species, while effects on shoot biomass differed among species, but did not depend on inoculum. Only one species experienced drought-stress-ameliorating effects of soil biota. Drought-legacy effects on plant performance were positive, but depended on soil inoculum in case of root biomass, and on soil inoculum and species identity in case of shoot biomass. Drought-legacy effects were often mediated by first-phase biomass. In some species this effect was independent of inoculum, suggesting an abiotic legacy effect. In others, low first-phase biomass corresponded with high second-phase performance in presence of the most complex soil community. We conclude that drought-legacy effects on plant performance were soil-community-dependent but positive, suggesting that plants establishing after drought may benefit from increased nutrient availability and more positive impacts of soil biota.
Data from: Predator-mediated negative effects of overabundant snow geese on arctic-nesting shorebirds
Overabundant species can strongly impact ecosystem functioning through trophic cascades. The strong increase in several arctic geese populations, primarily due to changes in agricultural practices in temperate regions, can have severe direct impacts on tundra ecosystems through vegetation degradation. However, predator-mediated negative effects of goose overabundance on other tundra species can also be significant but are poorly understood. We tested the hypothesis that goose abundance negatively affects arctic-nesting shorebirds by increasing nest predation pressure. We used six years of data collected within and near a greater snow goose colony (Chen caerulescens atlantica) to evaluate the effect of geese on the spatial variation in (1) the occurrence of shorebird nest predators, (2) the nest predation risk (with artificial shorebird nests), and (3) the occurrence of nesting shorebirds. We found that the goose colony had a strong influence on the spatial distribution of nest predators and nesting shorebirds. Occurrence of predators decreased, while occurrence of nesting shorebirds increased with distance from the centroid of the colony. The strength of these effects was modulated by lemming density, the preferred prey for predators. Shorebird nest predation risk also decreased with distance from the colony. Overall, these results indicate that goose abundance negatively affects arctic-nesting shorebirds through shared predators. Therefore, we show that the current decline of some arctic shorebird populations may be in part mediated by a negative effect of an overabundant species.
Mediating effects of Trait Emotional Intelligence on the association between Adverse Childhood Experiences (ACEs) and Self-reported Health
<p>Data for two studies which investigate the role of trait emotional intelligence in resilience following adverse childhood experiences. </p>
Elimination of HSV-2 infected cells is mediated predominantly by paracrine effects of tissue-resident T cell derived cytokines
<p>Movies associated with manuscript entitled "Elimination of HSV-2 infected cells is mediated predominantly by paracrine effects of tissue-resident T cell derived cytokines"</p> <p>available on https://doi.org/10.1101/610634 </p>
Data from: Resource-mediated indirect effects of grassland management on arthropod diversity
Intensive land use is a driving force for biodiversity decline in many ecosystems. In semi-natural grasslands, land-use activities such as mowing, grazing and fertilization affect the diversity of plants and arthropods, but the combined effects of different drivers and the chain of effects are largely unknown. In this study we used structural equation modelling to analyse how the arthropod communities in managed grasslands respond to land use and whether these responses are mediated through changes in resource diversity or resource quantity (biomass). Plants were considered resources for herbivores which themselves were considered resources for predators. Plant and arthropod (herbivores and predators) communities were sampled on 141 meadows, pastures and mown pastures within three regions in Germany in 2008 and 2009. Increasing land-use intensity generally increased plant biomass and decreased plant diversity, mainly through increasing fertilization. Herbivore diversity decreased together with plant diversity but showed no response to changes in plant biomass. Hence, landuse effects on herbivore diversity were mediated through resource diversity rather than quantity. Land-use effects on predator diversity were mediated by both herbivore diversity (resource diversity) and herbivore quantity (herbivore biomass), but indirect effects through resource quantity were stronger. Our findings highlight the importance of assessing both direct and indirect effects of land-use intensity and mode on different trophic levels. In addition to the overall effects, there were subtle differences between the different regions, pointing to the importance of regional land-use specificities. Our study underlines the commonly observed strong effect of grassland land use on biodiversity. It also highlights that mechanistic approaches help us to understand how different land-use modes affect biodiversity.
Data from: Evolution mediates the effects of apex predation on aquatic food webs
Ecological and evolutionary mechanisms are increasingly thought to shape local community dynamics. Here, I evaluate if the local adaptation of a meso-predator to an apex predator alters local food webs. The marbled salamander (Ambystoma opacum) is an apex predator that consumes both the spotted salamander (Ambystoma maculatum) and shared zooplankton prey. Common garden experiments reveal that spotted salamander populations which co-occur with marbled salamanders forage more intensely than those that face other predator species. These foraging differences, in turn, alter the diversity, abundance and composition of zooplankton communities in common garden experiments and natural ponds. Locally adapted spotted salamanders exacerbate prey biomass declines associated with apex predation, but dampen the top-down effects of apex predation on prey diversity. Countergradient selection on foraging explains why locally adapted spotted salamanders exacerbate prey biomass declines. The two salamander species prefer different prey species, which explains why adapted spotted salamanders buffer changes in prey composition owing to apex predation. Results suggest that local adaptation can strongly mediate effects from apex predation on local food webs. Community ecologists might often need to consider the evolutionary history of populations to understand local diversity patterns, food web dynamics, resource gradients and their responses to disturbance.
Data from: Vascular plants mediate the effects of aridity and soil properties on ammonia-oxidizing bacteria and archaea
An integrated perspective of the most important factors driving the abundance of ammonia-oxidizing bacteria (AOB) and archaea (AOA) in natural ecosystems is lacking, especially in drylands. We evaluated how different climatic, abiotic, and nutrient-related factors determine AOA and AOB abundance in bare and vegetated microsites from grasslands throughout the Mediterranean Basin. We found a strong negative relationship between the abundance of AOA genes and soil fertility (availability of C, N, and P). Aridity and other abiotic factors (pH, sand content, and electrical conductivity) were more important than soil fertility in modulating the AOA/AOB ratio. AOB were more abundant under vegetated microsites, while AOA, highly resistant to stressful conditions, were more abundant in bare ground areas. These results suggest that AOA may carry out nitrification in less fertile microsites, while AOB predominate under more fertile conditions. Our results indicate that the influence of aridity and pH on the relative dominance of AOA and AOB genes is ultimately determined by local-scale environmental changes promoted by perennial vegetation. Thus, in spatially heterogeneous ecosystems such as drylands, there is a mutual exclusion and niche division between these microorganisms, suggesting that they may be functionally complementary.
Data from: Mediation of seed provisioning in the transmission of environmental maternal effects in Maritime pine (Pinus pinaster Aiton)
Although maternal environmental effects are increasingly recognized as an important source of phenotypic variation with relevant impacts in evolutionary processes, their relevance in long-lived plants such as pine trees is largely unknown. Here, we used a powerful sample size and a strong quantitative genetic approach to analyse the sources of variation of early seedling performance and to identify seed mass (SM)-dependent and -independent maternal environmental effects in Maritime pine. We measured SM of 8924 individual seeds collected from 10 genotypes clonally replicated in two environments of contrasting quality (favourable and stressful), and we measured seedling growth rate and biomass allocation to roots and shoots. SM was extremely variable (up to 14-fold) and strongly determined by the maternal environment and the genotype of the mother tree. The favourable maternal environment led to larger cones, larger seeds and reduced SM variability. The maternal environment also determined the offspring phenotype, with seedlings coming from the favourable environment being 35% larger and with greater root/shoot ratio. Transgenerational plasticity appears, thus, to be a relevant source of phenotypic variation in the early performance of this pine species. Seed provisioning explained most of the effect of the maternal environment on seedling total biomass. Environmental maternal effects on seedling biomass allocation were, however, determined through SM-independent mechanisms, suggesting that other epigenetic regulation channels may be involved.
Data for: Genomic heterozygosity is associated with parasite abundance, but the effects are not mediated by host condition
<p>Whether, when, and how genetic diversity buffers individuals and populations against infectious disease risk is a critical and open question for understanding wildlife disease and zoonotic disease risk. Several, but not all, studies have found negative relationships between infection and heterozygosity in wildlife. Since they can host multiple zoonotic infections, we sampled a population of wild deer mice (<em>Peromyscus maniculatus</em>), sequenced their genomes, and examined their fecal samples for coccidia and nematode eggs. We analyzed coccidia infection status, abundance, and coinfection status in relation to per-locus and per-individual measures of heterozygosity, as well as identified SNPs associated with infection status. Since heterozygosity might affect host condition, and condition is known to affect immunity, it was included as a co-variate in the per-individual analyses and as response variable in relation to heterozygosity. Not only did coccidia-infected individuals have lower levels of genome-wide per-locus diversity across all metrics, but we found an inverse relationship between genomic diversity and severity of coccidia infection. We also found weaker evidence that coinfected individuals had lower levels of private allelic variation than all other groups. In the per-individual analyses, relationships between heterozygosity and infection were marginal but followed the same negative trends. Condition was negatively correlated with infection, but was not associated with heterozygosity, suggesting that effects of heterozygosity on infection were not mediated by host condition in this system. Association tests identified multiple loci involved in the inflammatory response, with a particular role for NF-κB signaling, supporting previous work on the genetic basis of coccidia resistance. Taken together, we find that increased genome-wide neutral diversity, the presence of specific genetic variants, and improved condition positively impact infection status. Our results underscore the importance of considering host genomic variation as a buffer against infection, especially in systems that can harbor zoonotic diseases.</p>
Spore traits mediate disturbance effects on AM fungal community composition and mutualisms
<p>Trait-based approaches in ecology are powerful tools for understanding how organisms interact with their environment. These approaches show particular promise in disturbance and community ecology contexts for understanding how disturbances like prescribed fire and bison grazing influence interactions between mutualists like AM fungi and their plant hosts. In this work, we examined how disturbance effects on AM fungal spore community composition and mutualisms were mediated by selection for specific functional spore traits at both the species and community level. We tested these questions by analyzing AM fungal spore communities and traits from a frequently burned and grazed (bison) tallgrass prairie system and using these spores to inoculate a plant growth response experiment. Selection for darker, pigmented AM fungal spores, changes in the abundance and volume of individual AM fungal taxa, and altered sporulation, were indicators of fire and grazing effects on AM fungal community composition. Disturbance-associated changes in AM fungal community composition were then correlated with altered growth responses of <em>Schizachyrium scoparium</em> grass. Our work shows that utilization of trait-based approaches in ecology can clarify the mechanisms that underly belowground responses to disturbance, and provide a useful framework for understanding interactions between organisms and their environment.</p>
The Mediating Effect of Psychological Well-Being on the Relationship between Psychosocial Working Conditions and Work Engagement
<p>Raw data for article titled: The Mediating Effect of Psychological Well-Being on the Relationship between Psychosocial Working Conditions and Work EngagementThe Mediating Effect of Psychological Well-Being on the Relationship between Psychosocial Working Conditions and Work Engagement</p>
Data from: Legacy effects in temporally-separated tadpole species are not mediated by invasive Western Mosquitofish (Gambusia affinis)
<p>Temporally separated species are often thought to have limited competition over a shared resource. However, early arriving species may consume a limited resource such that later arriving species have access to fewer resources and thus experience competitive effects, even if they are temporally separated (i.e., they experience legacy effects from the early species). The presence of a predator might affect potential legacy effects by influencing the behavior or survivorship of the early species. Using a mesocosm experiment, I examined whether the presence of non-native Western Mosquitofish (<em>Gambusia</em> <em>affinis</em>) mediated legacy effects in the interaction of two temporally separated species of tadpoles, early arriving American Toads (<em>Anaxyrus</em> <em>americanus</em>) and late arriving Bullfrogs (<em>Rana</em> <em>catesbeiana</em>). <em>Anaxyrus</em> <em>americanus</em> tadpoles reduced <em>R. catesbeiana</em> tadpole growth despite all <em>A</em>. <em>americanus</em> tadpoles metamorphosing 8 d before the introduction of <em>R. catesbeiana</em> tadpoles into the mesocosms (i.e., legacy effects). <em>Gambusia</em> <em>affinis</em> had limited effects on <em>A</em>. <em>americanus</em> (1 d delay in metamorphosis but no effect on survivorship or size at metamorphosis) and positive effects on <em>R. catesbeiana</em> (increased growth). There were no significant interactions between the <em>A. americanus</em> tadpole density and <em>G. affinis</em> treatments. In conclusion, I found evidence of significant legacy effects of <em>A. americanus</em> tadpoles on <em>R</em>. <em>catesbeiana</em> tadpoles, but no evidence that <em>G. affinis</em> mediated the legacy effects.</p>
Dataset of scientific article: "Effect of miR-34a on expression of clock and clock-controlled genes in human cancer DLD1 and Lovo cells with different backgrounds in respect to p53 functionality and 17β-estradiol-mediated regulation"
<p>The dataset includes "raw" data used for the calculation of gene expression, wound healing test, fluorescence intensity, and MTS test.</p> <p> </p>
Recurrent pain symptoms in adolescents with generalized and specific problematic Internet use: Associations analysis, confounding and mediating effects of comorbid psychosocial problems
<p>Problematic Internet use (PIU) in adolescents is a global public health issue especially exacerbated by the restrictions caused by the COVID-19 epidemic. The authors assume a negative impact of PIU not only in relation to adolescents' mental health and social behaviour but also relative to somatic components of their health, particularly concerning the occurrence of pain symptoms – recurrent headache (RH), recurrent abdominal pain (RAP), and recurrent back pain (RBP). The present study aims to identify the associations between different types of PIU (generalized PIU – PIUgen, problematic computer game use – PUgame, and problematic social media use – PUsocial), and pain symptoms (RH, RAP and RBP), and to determine the role of psychosocial factors in the emergence of these associations.</p> <p><strong>Methods: </strong>The<strong> </strong>research represents a one-stage observational study of 4,411 adolescents (53.6% girls; Mage = 14.53±1.52) in an unbiased school sample, held in three large cities of Central Siberia. The frequency and intensity of pain symptoms over the past three months were ascertained by completing a number of questionnaires. The following questionnaires were used to identify PIU and its types: the Chen Internet Addiction Scale (CIAS for PIUgen), the Game Addiction Scale for Adolescents (GASA for PUgame), and The Social Media Disorder Scale (SMDS for PUsocial). The psychological problems were assessed using The Strengths and Difficulties Questionnaire (SDQ). Logistic and linear regression, as well as mediation analysis, were used.</p> <p><strong>Results:</strong> Considering both the frequency and intensity of pain, along with the presence of psychosocial problems as a confounder, a direct association of RH with PUsocial only was revealed (OR = 1.68, CI = 1.33–2.11). Using the same criteria, RAP in this sample was associated with PIUgen and PUsocial (OR = 1.99, CI = 1.51–2.62 and 2.10, CI = 1.62–2.72, respectively). RBP, according to the obtained data, was also associated with PIUgen and PUsocial both in terms of pain frequency (OR = 1.99, CI = 1.53–2.57 and OR = 2.20, CI = 1.44–3.38, respectively) and intensity. PUgame was weakly associated only with RAP and showed no significant association with RH and RBP. The mediation analysis indicated that the revealed positive associations were largely mediated by psychosocial problems comorbid for PIUgen and PUsocial (but not PUgame).</p> <p><strong>Conclusions: </strong>The<strong> </strong>frequently reported association of recurrent pain symptoms with PIU in adolescents is largely mediated by comorbid psychosocial problems. The direct effect of excessive Internet use on somatic pain symptoms in adolescents is mild-to-moderate and depends on the content predominantly consumed.</p>
Effect of Saffron Supplementation on Macular Cone-mediated Function in Age-related Macular Degeneration
ClinicalTrials.gov study NCT00951288. IPD Sharing: Not stated. Countries: 1. Publications: 4.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.